Google's Face Unlock system has become a headline feature for the latest Android smartphones since its introducing in Ice Cream Sandwich, making its way into several TV commercials for the Samsung Galaxy Nexus. However, it has come under scrutiny a number of times in recent months after it was discovered that a photograph of the handset's owner could be used to trick the feature.

To address this issue on its own devices, Samsung has released a custom version of Face Unlock that requires users to blink before it unlocks their handset. This, according to the Korean company, proves that they are human and not just a photograph.

Included in the firmware upgrade is the 'Face Unlock' feature found in the ICS upgrade. In response to security issues raised regarding Face Unlock, Samsung incorporated blinking for added security. Also included is 'Photo Editor', 'Beta Font' function for font size control, and 'Snapshot' which allows you to take photos while recording video.

Despite aggressively defending the feature shortly after its release, Google later confessed that Face Unlock is more of a gimmick than true biometric security. But for many Android users, its strong enough to keep their data safe without having to deal with dreaded pass codes.